Since it is difficult to provide adequate quality of service to large-bandwidth calls in integrated-service networks, service providers may allow some customers to book ahead their calls. We propose a scheme for sharing resources among book-ahead calls (that announce their holding times upon arrival) and non-book-ahead calls (that do not announce their holding times). The basis for this sharing is an admission control algorithm in which admission is allowed if an approximate interrupt probability (computed in real time) is below a threshold. Simulation experiments show that the proposed admission control algorithm is superior to alternative schemes that do not allow interruption, such as a strict partitioning of resources.
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